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Full text of "The Morphology And Evolution Of The Apes And Man"

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300           MORPHOLOGY AND EVOLUTION
Sealenus inedius (Seal. Med.) from C4. Omo-hyoid    (0-H.M.)     and    sterno-thyroid
(S-T.M.) from 02; sterno-hyoid (S-H.M.)
from C2 and 03. Diaphragm by phrenic nerve (P.N.) from 02-
05. C. Cutaneous Branches (superficial).
Small   occipital   (O.N.),   transverse   cervical
(T.O.N.) from C2-C3. Acromial, clavicular and sternal from 03 and
04. Great auricular from 02.
O-HM S-T.M
5-CK.
FIG. 54.The cervical plexus in the  Chimpanzee.     Letters  explained
in text.
In the Gorilla the chief points in which the plexus
differs from the above are:    (1) The loop between Cl
and 02 is double instead of single.    (2) The supraclavi-
cular cutaneous- nerves are more numerous and form a
'plexus   above   the   clavicle.     (3)   The   sterno-mastoid
r muscle is innervated by 02 and 03.    (4) The  levator
anguli scapulae is innervated by 03 and 04,    (5) The